Question: Atoms that decay via electron capture A lose two protons and two neutrons B gain one proton, gain one neutron, and lose one electron C

Atoms that decay via electron capture

A lose two protons and two neutrons

B gain one proton, gain one neutron, and lose one electron

C gain one proton, lose one neutron, and lose one electron

D lose one proton and gain one neutron

If there are 200 radioactive parent isotopes to start with, how many radioactive parent isotopes would be left after two half-lives have past?

100, 50, 25, 0

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